JP6118305B2 - Manufacturing method of battery wiring module - Google Patents

Description

  The present invention relates to a method for manufacturing a battery wiring module.

In an in-vehicle battery pack connected to a power conversion device for driving a motor in a vehicle such as a hybrid vehicle or an electric vehicle, the positive and negative terminals of a large number of battery cells are alternately stacked in opposite directions. Thus, the battery modules are arranged side by side. A plurality of battery cells are connected in series or in parallel by connecting electrode terminals of adjacent battery cells with a connecting member such as a bus bar.
When assembling the battery module having the above-described configuration, it is necessary to connect a plurality of electrode terminals with a connecting member. Accordingly, a bus bar module is used in which a plurality of connecting members arranged in a mold by insert molding or the like are integrally formed in an insulating resin in accordance with the number of electrode terminals to be connected.

On the other hand, when a plurality of battery cells are connected in series or in parallel, if battery characteristics such as battery voltage are not uniform between the battery cells, the battery may be deteriorated or damaged. Therefore, in battery packs for vehicles, voltage detection lines for detecting the voltage of the battery cells are attached to each bus bar in order to stop charging and discharging before abnormality occurs in the voltage between the battery cells. ing.
In the conventional bus bar module, the voltage detection wire is peeled off from the end of the covered electric wire, a round terminal is crimped to the core wire, and the round terminal is fitted to the electrode terminal of the battery cell. A structure in which the connecting member is fastened together with a nut has been adopted.

  However, such a bus bar module has a problem that when the number of voltage detection lines is large, the bus bar module becomes thick and difficult to bend, and is heavy and difficult to wire. In addition, the positive terminal and the negative terminal projecting from the battery cell are fitted together with a bus bar that is a connecting member and a round terminal that is crimped to the voltage detection line and is tightened with a nut. For this reason, there has been a problem that the resistance of the contact surface between the bus bar and the round terminal is increased and a voltage drop occurs.

Thus, a high voltage detection module device (bus bar module) for a battery pack that can be easily wired to each battery cell with a simple structure and does not cause a voltage drop has been proposed (for example, see Patent Document 1).
In this battery pack high voltage detection module device, a plurality of bus bars are arranged in a state in which predetermined positive terminals and negative terminals of battery cells are connected to an insulating frame combined with the battery pack body. A flat cable is disposed in the region of the insulating frame, and a conductor wire cut into a predetermined shape between the conductor wires of the flat cable and cut off leaving the root is welded to a predetermined bus bar.

  According to the high voltage detection module device of the battery pack having the above configuration, since the configuration includes the members of the insulating frame, the plurality of bus bars, and the flat cable, the configuration can be simplified. In addition, the high voltage detection module device can be configured by a simple operation of disposing the bus bar on the insulating frame, cutting off each conductor wire of the flat cable, and welding the conductor wire to the bus bar.

JP 2010-1114025 A

  However, the insulating frame body in the high-voltage detection module device of Patent Document 1 has a rectangular plate shape and has a plurality of protrusions at a predetermined interval on the lower surface and a plurality of through holes at a predetermined interval in the plate portion. Is open. That is, the predetermined interval and the number of the plurality of protrusions fitted into the gaps between the battery cells, and the predetermined interval and opening of the plurality of through-holes opened at the interval between the + terminal and the − terminal of the battery cell. The number must be changed according to the size of the battery cell, and the insulating frame is a dedicated component for each type of battery pack. Therefore, the high voltage detection module device has no versatility, and it is difficult to reduce the manufacturing cost.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and an object of the present invention is to provide a battery wiring module manufacturing method that can be easily wired to each battery cell with a simple structure and that is highly versatile and can reduce manufacturing costs. Is to provide.

The above object of the present invention is achieved by the following configuration.
(1) A method for manufacturing a battery wiring module to be combined with a battery module having a plurality of battery cells that are alternately stacked in opposite directions so that a positive electrode terminal and a negative electrode terminal are adjacent to each other, and having a predetermined interval. along at least one side of the plurality of linear conductors arranged in parallel to the disposing step long chain busbars only the side edges was ligated chain portions adjacent in the plurality of bus bars are arranged in parallel, wherein After the placing step, the outer peripheral portion of the plurality of linear conductors and the side edge portion adjacent to the plurality of linear conductors in the chain bus bar are covered with an insulating resin portion integrally molded. After the step and the covering step, a plurality of the bus bars for electrically connecting the adjacent positive electrode terminal and the negative electrode terminal by breaking the chain part of the chain bus bar. A method of manufacturing a battery wiring module, comprising: a breaking step that is separated; and a connecting step in which the plurality of linear conductors are electrically connected to the predetermined bus bars after the breaking step , respectively. .

According to the manufacturing method of the battery wiring module having the configuration of (1), in the covering step, the outer peripheral portion of the plurality of linear conductors and the side edge portion of the long chain bus bar are integrally extruded. By covering with the resin portion, a long chain circuit body in which a plurality of linear conductors and a chain bus bar are integrally arranged in parallel is formed. Since this chain circuit body is continuously formed by extrusion, the manufacturing cost can be easily reduced.
In the breaking step, the plurality of bus bars connected via the insulating resin portion are broken by breaking the plurality of chain portions formed at predetermined intervals along the longitudinal direction of the chain circuit body. It is integrally disposed along the linear conductor. Therefore, it is possible to easily form bus bars each set at a predetermined interval according to the battery cell.
As the chain bus bar, various bus bars can be prepared in which the bus bars are connected to each other at different intervals according to the interval between the positive electrode terminal and the negative electrode terminal. In the coating step, a desired chain bus bar can be selected from these and used. Thereby, according to the size etc. of a battery cell, the bus bar which changed the space | interval suitably can be formed easily, and a battery wiring module with very high versatility can be obtained.
Furthermore, since the plurality of bus bars are integrally disposed along the linear conductor via the insulating resin portion, the mounting workability when the battery wiring module is combined with the battery module does not deteriorate. Of course, there is no need to separately prepare a member for arranging a plurality of bus bars in the battery module.
In addition, in the long chain bus bar, chain portions having a sufficiently smaller width in the same direction than the width of the bus bar in the direction orthogonal to the longitudinal direction of the chain bus bar are formed at predetermined intervals. Therefore, when the chain circuit body after the coating step is wound around the winding center in the direction orthogonal to the longitudinal direction, the chain bus bar having a small cross-sectional area easily deforms, so that the small-diameter winding body Can be wound on a take-up reel or the like. As a result, the chain circuit body after the covering step can be wound into a small diameter, and the winding chain circuit body wound with the chain circuit body can be easily transported and handled, and the productivity can be improved.
Note that the winding chain circuit body is spirally wound around the winding reel as long as no permanent distortion remains in the bus bar. However, permanent distortion may occur in the chain portion. Since the chain portion is removed in the breaking process, the contact reliability with the positive electrode terminal or the negative electrode terminal is not affected even if deformation occurs.

(2) Manufacturing of the battery wiring module having the configuration of (1), wherein the chain bus bar in the covering step is formed with a terminal insertion hole for inserting the positive terminal and the negative terminal. Method.

According to the manufacturing method of the battery wiring module having the configuration (2), the terminal insertion hole is formed in advance in the bus bar of the chain bus bar. The bus bar has a small cross-sectional area at the portion where the terminal insertion hole is provided. The bus bar having the terminal insertion hole is less rigid than the bus bar having no terminal insertion hole. Therefore, the chain bus bar is easily elastically deformed not only by the flexibility of the chain part but also by the decrease in rigidity at the terminal insertion hole part. Thereby, the chain circuit body after the covering step provided with the chain bus bar having the terminal insertion hole in the bus bar can be wound with a smaller diameter.
Further, by using a chain bus bar in which terminal insertion holes are previously drilled, the breaking process is completed only by cutting the chain portion. Thereby, the processing of the terminal insertion hole in the breaking process can be reduced, and the post-processing cost can be reduced.

(3) The chain portion is formed on the side edge of the chain bus bar,
In the covering step, the chain part is covered with the insulating resin part,
In the breaking step, the chain portion is broken together with the insulating resin portion . The method of manufacturing a battery wiring module having the configuration of (1) or (2) above.

  According to the manufacturing method of the battery wiring module having the configuration (3), the chain part is disposed on the side edge part of the chain bus bar. The chain portion disposed on the side edge portion is covered with the insulating resin portion in the covering step. This chain portion is broken together with the insulating resin portion in the breaking step. Therefore, the bus bar has a conspicuous cut mark (burr or the like) in the chain portion in the outline in plan view. Thereby, the appearance of a bus bar can be made favorable.

(4) The chain portion is formed at a central position in a direction orthogonal to the longitudinal direction of the chain bus bar ,
In the coating step, the chain part is not covered by the insulating resin part,
The method of manufacturing a battery wiring module having the configuration (1) or (2) , wherein the insulating resin portion is not broken in the breaking step .

  According to the manufacturing method of the battery wiring module having the configuration (4), the chain portion is not covered with the insulating resin portion in the covering step. In the breaking process, only the chain portion is broken and the insulating resin portion is not broken. For this reason, notch loss does not occur in the insulating resin portion, and the durability of the insulating resin portion can be enhanced. Moreover, since the chain part is not covered with the insulating resin part in the chain bus bar in which the chain part is arranged at the center position, the presence or absence of the chain part after the breaking process can be easily visually confirmed.

  According to the manufacturing method of the battery wiring module according to the present invention, it is possible to easily wire each battery cell with a simple structure, and the versatility is high and the manufacturing cost can be reduced.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

1 is an overall perspective view of a battery pack in which a battery wiring module according to a first embodiment of the present invention is combined. It is a top view of the battery pack shown in FIG. (A) is principal part sectional drawing of the battery pack in the AA line of FIG. 2, (b) is sectional drawing of the battery wiring module in the BB line of FIG. It is a fragmentary perspective view of the battery wiring module shown in FIG. (A)-(d) is a principal part plane and cross-sectional view explaining the manufacturing process of the battery wiring module shown in FIG. It is a partial top view of a battery wiring module. It is a principal part disassembled perspective view of the battery pack shown in FIG. (A)-(c) is a principal part plane explaining the manufacturing process of the battery wiring module which concerns on the comparative example using a elongate flat conductor. (A) is the schematic side view which looked at the winding body by which the flat circuit body using the flat conductor shown in FIG.8 (b) was wound up from the direction along an axis line, (b) is FIG.5 (b). It is the schematic side view which looked at the wound body by which the chain circuit body using the chain bus bar shown in FIG. (A)-(c) is a principal part top view explaining the manufacturing process of the battery wiring module which concerns on 2nd Embodiment of this invention. (A), (b) is a top view of the battery wiring module which concerns on 3rd Embodiment of this invention.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1-3, the battery pack 10 which combined battery wiring module 30A, 30B which concerns on 1st Embodiment of this invention is used as drive sources, such as an electric vehicle or a hybrid vehicle, for example. The battery module 20 includes a plurality of battery cells 12 arranged side by side. The battery module 20 is fixed by arranging a plurality of battery cells 12 in a box-shaped housing (not shown) via a separator.

  The battery wiring modules 30A and 30B according to the first embodiment include a plurality of bus bars 32A and 32B that connect a plurality of battery cells 12 in series, a voltage detection line 40 that measures the voltage of each battery cell 12, and voltage detection. And a connector 50 connected and fixed to one end of the wire 40.

  The battery cell 12 is a secondary battery. As shown in FIG. 7, the positive electrode terminal 13A and the negative electrode terminal 13B protrude from the upper surface, and when arranged in the housing, as shown in FIG. Each of the battery cells 12 is arranged so that the negative electrode terminal 13B and the negative electrode terminal 13B are alternately stacked in the opposite directions. The positive terminal 13A and the negative terminal 13B are fastened by the nut 15 with the bus bars 32A and 32B interposed therebetween.

  On both sides of each battery cell 12, separators 22 made of insulating resin as shown in FIG. A partition portion 24 that protrudes upward from the upper surface of the battery cell 12 is formed at the upper end of the separator 22. This partition part 24 is arrange | positioned at the slit 45 (space) formed between adjacent bus-bar 32A, 32B, and prevents the short circuit between the electrode terminals by a tool.

As shown in FIG. 2, strip-shaped battery wiring modules 30 </ b> A and 30 </ b> B are arranged on the plurality of battery cells 12 along the arrangement direction of the battery cells 12.
The battery wiring modules 30 </ b> A and 30 </ b> B are arranged in two rows along the arrangement direction of the battery cells 12. In each of the battery wiring modules 30A and 30B, a plurality of bus bars 32A and 32B are respectively arranged in two rows on the positive electrode terminal 13A and the negative electrode terminal 13B arranged alternately along the arrangement direction of the battery cells 12, and the voltage detection line 40 is provided. The bus bars 32A and 32B are arranged in parallel inside the bus bar row.

  The bus bars 32A and 32B constituting the battery wiring modules 30A and 30B are arranged so that the terminal insertion holes 34 through which the positive terminal 13A and the negative terminal 13B are inserted and connected are arranged in a line. Of the two rows of busbars, in the backside busbar shown in FIG. 2, one-hole busbar 32B having one terminal insertion hole 34 is disposed at both ends, and two 1's disposed at both ends. Five two-hole bus bars 32A each having two terminal insertion holes 34 are arranged between the bus bars 32B. Among the two bus bar rows, in the front bus bar row shown in FIG. 2, six two-hole bus bars 32A are arranged.

As shown in FIG. 5C, each of the bus bars 32A and 32B has a substantially rectangular shape, and is formed with a terminal insertion hole 34 through which the positive terminal 13A and the negative terminal 13B are inserted and connected. The bus bars 32 </ b> A and 32 </ b> B are formed by punching a chain portion 46 of a long chain bus bar 33 made of a metal plate material such as copper, copper alloy, aluminum, aluminum alloy, gold, and stainless steel (SUS) in a later-described breaking process. It is formed. The bus bars 32A and 32B may be plated with Sn, Ni, Ag, Au, etc. in order to improve weldability.
The bus bars 32A and 32B of the present embodiment are electrically connected by screwing and tightening the nut 15 to the positive terminal 13A and the negative terminal 13B inserted through the terminal insertion hole 34. Of course, the bus bar according to the present invention may be electrically connected by welding to the positive terminal and the negative terminal without forming the terminal insertion hole 34.

  The voltage detection wires 40 constituting the battery wiring modules 30A and 30B are insulating resins obtained by integrally extruding the outer peripheral portions of a plurality of linear conductors 21 arranged in parallel with a predetermined interval in a coating process described later. It is covered with a portion 23 (for example, an insulating resin such as polypropylene (PP), polyvinyl chloride (PVC), polybutylene terephthalate (PBT), polyethylene terephthalate (PET)) to form a flat cable. As the linear conductor according to the present invention, various conductors such as a single wire such as a flat conductor and a round conductor, and a stranded wire can be used.

  According to the battery wiring modules 30A and 30B according to the first embodiment, the side edge portion 32a adjacent to the linear conductor 21 in the bus bars 32A and 32B is covered with the insulating resin portion 23 that is integrally formed by extrusion. ing. Therefore, the plurality of bus bars 32A and 32B, in which the side edge portion 32a adjacent to the linear conductor 21 is connected to the voltage detection line 40 through the insulating resin portion 23, are spaced apart from each other by one side edge of the voltage detection line 40. Are integrally disposed along the line.

The bus bars 32A in the battery wiring modules 30A and 30B electrically connect the adjacent positive electrode terminal 13A and the negative electrode terminal 13B, respectively, and correspond to the linear conductor 21 of the voltage detection line 40 for measuring the voltage of the battery cell 12. And are electrically connected.
In this embodiment, the bus bar 32 </ b> A and the corresponding linear conductor 21 of the voltage detection line 40 are connected by a connection member 35. The connecting member 35 is formed by punching from a metal plate so that it has a press contact blade portion 37 at one end of the main body and a welded portion 39 at the other end. Then, as shown in FIG. 3B, the press contact blade portion 37 of the connection member 35 is press connected to the predetermined linear conductor 21, and the welded portion 39 is connected to the predetermined bus bar 32A by welding (FIG. 3B). 4). The “welding connection” in the present embodiment includes various known welding connections such as spot welding, ultrasonic welding, and laser welding. Moreover, the connection member of this invention is not restricted to the connection member 35 of this embodiment which has the press-contacting blade part 37 in one end, Various forms can be taken based on the meaning of this invention, such as an electric wire and a bus bar.

Further, the bus bar 32B in the battery wiring module 30A is electrically connected to the positive terminal 13A or the negative terminal 13B at both ends, and the corresponding linear conductor of the voltage detection line 40 for measuring the voltage of the battery cell 12. 21 is electrically connected.
In this embodiment, the bus bar 32B and the corresponding linear conductor 21 of the voltage detection line 40 are connected by a cut and raised piece 36 formed on the side edge of the bus bar 32B. The cut-and-raised piece 36 is bent along the side edge of the bus bar 32B, and the distal end portion is welded to the predetermined linear conductor 21 (see FIG. 7). The cut and raised piece 36 can select the predetermined linear conductor 21 to which the tip end portion is welded by appropriately changing the bending position and changing the protruding position of the tip end portion. The cut and raised piece 36 can also select the predetermined linear conductor 21 to which the intermediate portion is welded by appropriately changing the welding position without changing the bending position.

Next, the manufacturing method of battery wiring module 30A, 30B which has the said structure is demonstrated. Since the battery wiring modules 30A and 30B are manufactured by substantially the same manufacturing process, the battery wiring module 30B will be described below as an example.
In the manufacturing method of the battery wiring module 30B according to the first embodiment, the long chain bus bars 33 are arranged in parallel along one side of the plurality of linear conductors 21 arranged in parallel with a predetermined interval. An insulating resin portion in which a process (see FIG. 5A), an outer peripheral portion of the plurality of linear conductors 21, and a side edge portion 33a adjacent to the linear conductor 21 in the chain bus bar 33 are integrally molded. The adjacent positive electrode terminal 13 </ b> A and the negative electrode terminal are formed by the covering step (see FIG. 5B) covered by the cover 23 and the chain portions 46 formed at predetermined intervals along the longitudinal direction of the chain bus bar 33 being broken. A breaking process (see FIG. 5C) in which a plurality of bus bars 32A for electrically connecting 13B is formed, and a plurality of linear conductors 21 are electrically connected to predetermined bus bars 32A by connecting members 35, respectively. Close to Is the connecting step includes (FIG. 5 (d) refer) and, the.

First, in the arranging step and the covering step shown in FIGS. 5A and 5B, a die capable of arranging a plurality of linear conductors 21 and long chain bus bars 33 in parallel with a predetermined interval. Covering the outer peripheral portion of the plurality of linear conductors 21 and the side edge portion 33a adjacent to the linear conductor 21 in the chain bus bar 33 with a known extruder using an extrusion die having an opening, an insulating resin portion 23 is extruded.
That is, the outer peripheral portion of the plurality of linear conductors 21 and the side edge portion 33a of the long chain bus bar 33 are covered by the insulating resin portion 23 that is integrally extruded. As a result, a long chain circuit body 60 is formed in which the plurality of linear conductors 21 constituting the flat cable-shaped voltage detection line 40 and the chain bus bar 33 are integrally arranged in parallel (FIG. 5 ( b)).

  Here, the chain bus bar 33 constituting the chain circuit body 60 is formed in a long shape by connecting a plurality of bus bars 32 </ b> A at the chain part 46. The width of the chain portion 46 is sufficiently smaller than the width of the chain bus bar 33 in the direction perpendicular to the longitudinal direction. Further, terminal insertion holes 34 for inserting the positive terminal 13A and the negative terminal 13B are formed in advance in the chain bus bar 33 at locations corresponding to the respective bus bars 32A. Furthermore, the chain part 46 is formed in the side edge part 33 a adjacent to the linear conductor 21 in the chain bus bar 33.

Next, in the breaking step shown in FIG. 5C, after the chain circuit body 60 is cut to a desired length in the longitudinal direction, the chain circuit bar 60 in the chain circuit bar 60 has a predetermined interval P along the longitudinal direction. A plurality of bus bars 32 </ b> A are separated by punching the formed chain portion 46. The chain part 46 is broken together with a part of the insulating resin part 23 covering the side edge part 33a.
At this time, the slit 45 is expanded in length in the longitudinal direction by punching the chain portion 46.

Next, in the connection step shown in FIG. 5D, the plurality of linear conductors 21 are electrically connected to predetermined bus bars 32A by connection members 35, respectively. In the connecting member 35, a press-contact blade portion 37 formed at one end of the main body is press-connected to the predetermined linear conductor 21, and a weld portion 39 formed at the other end of the main body is weld-connected to the predetermined bus bar 32A.
Then, the connector 50 is connected and fixed to one end of the voltage detection line 40, whereby the battery wiring module 30B is completed.

  In the battery wiring modules 30A and 30B configured in this way, the positive electrode terminal 13A and the negative electrode terminal 13B having opposite polarities are arranged between two adjacent battery cells 12 and 12 in the 12 battery cells 12. It is placed on the upper surface of the battery modules 20 arranged side by side.

  Next, as shown in FIG. 7, all the positive terminals 13A and the negative terminals 13B of the plurality of battery cells 12 arranged side by side are inserted into all the terminal insertion holes 34 of the bus bars 32A and 32B and into the slits 45. The partition part 24 of the separator 22 is inserted.

  Then, the nut 15 is screwed into the positive terminal 13A and the negative terminal 13B protruding from the terminal insertion hole 34 and tightened. When the nuts 15 are tightened on all the positive terminals 13A and the negative terminals 13B, the battery pack 10 in which the battery wiring modules 30A and 30B are attached to the battery module 20 is completed.

  That is, according to the manufacturing method of the battery wiring modules 30A and 30B according to the first embodiment, the outer peripheral portion of the plurality of linear conductors 21 and the side edge portion 33a of the long chain bus bar 33 are formed in the covering step. The long chain circuit body 60 in which the plurality of linear conductors 21 and the chain bus bar 33 are integrally arranged in parallel is formed by being covered with the insulating resin portion 23 that is integrally extruded. Since the chain circuit body 60 is continuously formed by extrusion molding using a known extruder (not shown), it is easy to reduce the manufacturing cost.

  In the breaking step, the chained portion 46 of the chained bus bar 33 in the chained circuit body 60 is broken, so that the plurality of bus bars 32A and 32B connected via the insulating resin portion 23 become the plurality of linear conductors 21. Are integrally disposed along the line.

  Since the plurality of bus bars 32A and 32B are integrally disposed along the linear conductor 21 via the insulating resin portion 23, the mounting workability when the battery wiring modules 30A and 30B are combined with the battery module 20 is reduced. Never do. Of course, it is not necessary to separately prepare a member for arranging the plurality of bus bars 32A and 32B in the battery module 20.

Furthermore, in the manufacturing method of the battery wiring module 30B according to the first embodiment, in the connection step, the tip end portion of the cut and raised piece 36 that is bent at the side edge of the bus bar 32B is a predetermined line in the voltage detection line 40. The conductor 21 is connected by welding.
Therefore, the predetermined bus bar 32B and the linear conductor 21 can be electrically connected by a simple operation of welding the tip end portion of the cut and raised piece 36 formed on the bus bar 32B to the predetermined linear conductor 21.

Moreover, in the manufacturing method of the battery wiring module 30 </ b> B according to the first embodiment, in the connection step, the connection members 35 are respectively connected to the predetermined linear conductors 21 in the plurality of linear conductors 21 covered with the insulating resin portion 23. A press-contact blade portion 37 formed at one end is press-connected and a weld portion 39 formed at the other end is weld-connected to a predetermined bus bar 32A.
Therefore, the press contact blade portion 37 formed at one end of the connection member 35 is press connected to the linear conductor 21 and the welding portion 39 formed at the other end of the connection member 35 is welded and connected to the bus bar 32A. The predetermined linear conductor 21 and the bus bar 32A can be electrically connected.

  In the manufacturing method of the battery wiring module 30B according to the first embodiment, various chain bus bars 33 are prepared in which the bus bars are connected by the chain portions 46 at different intervals according to the interval between the positive terminal 13A and the negative terminal 13B. Can be kept. In the coating step, a desired chain bus bar 33 can be selected from these and used. Thereby, according to the size of the battery cell 12, etc., the bus-bar 32A which changed the space | interval suitably can be formed easily, and battery wiring module 30B with very high versatility can be obtained.

8A to 8C are principal planes for explaining a manufacturing process of a battery wiring module according to a comparative example using a long flat conductor.
The manufacturing method of the battery wiring module according to the comparative example is an arrangement process in which long flat conductors 33A are arranged in parallel along one side of a plurality of linear conductors 21 arranged in parallel with a predetermined interval ( 8 (a)), an outer peripheral portion of the plurality of linear conductors 21, and a side edge portion 33a adjacent to the linear conductor 21 in the flat conductor 33A are integrally extruded. And the adjacent positive electrode by punching a plurality of slits 45 at predetermined intervals and punching the terminal insertion holes 34 along the longitudinal direction of the flat conductor 33A. A pressing step (see FIG. 8C) in which a plurality of bus bars 32A for electrically connecting the terminal 13A and the negative electrode terminal 13B are formed.

  In the battery wiring module manufacturing method according to this comparative example, the flat conductor 33A of the flat circuit body 60A shown in FIG. 8B after the linear conductor 21 and the flat conductor 33A are integrally formed is Difficult to bend in the winding process. For this reason, as shown to Fig.9 (a), the winding diameter of 61 A of winding flat circuit bodies which wound up the flat circuit body 60A becomes large, and we are anxious about the fall of productivity.

On the other hand, in the long chain bus bar 33 according to the first embodiment, the chain part 46 having a sufficiently smaller width in the same direction than the width in the direction perpendicular to the longitudinal direction of the chain bus bar 33 is a predetermined interval P. Is formed. Therefore, when the chain circuit body 60 after the covering step is wound around the winding center in the direction orthogonal to the longitudinal direction, the chain portion 46 of the chain bus bar 33 having a small cross-sectional area is easily deformed. It can be wound up on a take-up reel (not shown) as a small-diameter wound body shown in (b). As a result, the chain circuit body 60 after the covering step can be wound up to a smaller diameter than the wound flat circuit body 61A (see FIG. 9A), and the chain circuit body 60 is shown in FIG. 9B. The transportation and handling of the winding chain circuit body 61 can be facilitated and the productivity can be improved.
The winding chain circuit body 61 is spirally wound around the winding reel as long as no permanent distortion remains in the bus bar 32A. However, permanent distortion may occur in the chain portion 46. Since the chain part 46 is removed in the breaking process, even if deformation occurs, the contact reliability with the positive electrode terminal 13A and the negative electrode terminal 13B is not affected.

Moreover, in the manufacturing method of the battery wiring module 30 </ b> B according to the first embodiment, the terminal insertion hole 34 is formed in advance in the chain bus bar 33 in the covering step. The bus bar 32 </ b> A has a small cross-sectional area at a portion where the terminal insertion hole 34 is provided. The bus bar 32 </ b> A having the terminal insertion hole 34 is less rigid than the bus bar not having the terminal insertion hole 34. The chain bus bar 33 is easily elastically deformed due to a decrease in rigidity at the terminal insertion hole portion in addition to the flexibility by the chain portion 46. As a result, the chain circuit body 60 after the covering step including the chain bus bar 33 having the terminal insertion holes 34 can be wound with a smaller diameter.
Further, by using the chain bus bar 33 in which the terminal insertion hole 34 is previously drilled, the breaking process is completed only by cutting the chain portion 46. Thereby, the process of the terminal insertion hole 34 in a fracture | rupture process can be reduced, and a post-processing cost can be reduced.

  Furthermore, in the method for manufacturing the battery wiring module 30 </ b> B according to the first embodiment, the chain portion 46 is disposed on the side edge portion 33 a of the chain bus bar 33. The chain part 46 disposed on the side edge part 33a is covered with the insulating resin part 23 in the covering step. The chain portion 46 is broken together with the insulating resin portion 23 in the breaking step. Therefore, in the bus bar 32A, cut marks (burrs or the like) of the chain portion 46 are not conspicuous in the outline in plan view. Thereby, the appearance of the bus bar 32A can be improved.

Next, a method for manufacturing the battery wiring module 80 according to the second embodiment of the present invention will be described.
In the description of the second embodiment, the same members as those in the battery wiring module 30B of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
In the arranging step and the covering step in the method for manufacturing the battery wiring module 80 according to the second embodiment, as shown in FIGS. 10A and 10B, a plurality of linear conductors having a predetermined interval are provided. 21 and a long chain bus bar 33B can be arranged in parallel by a known extruder using an extrusion die having a die opening, and the linear conductor 21 in the chain bus bar 33B and the outer periphery of the chain bus bar 33B. The insulating resin portion 23 is extrusion-molded so as to cover the side edge portion 33a adjacent to.
That is, the outer peripheral portion of the plurality of linear conductors 21 and the side edge portion 33a of the long chain bus bar 33B are covered by the insulating resin portion 23 that is integrally extruded. As a result, a long chain circuit body 60B is formed in which the plurality of linear conductors 21 constituting the flat cable-shaped voltage detection line 40 and the chain bus bar 33B are integrally arranged in parallel.

  Here, the chain bus bar 33B constituting the chain circuit body 60B is formed in a long shape by connecting a plurality of bus bars 32A at the chain part 46B. The chain portion 46B is formed so that the width in the same direction is sufficiently smaller than the width in the direction perpendicular to the longitudinal direction of the chain bus bar 33B. Moreover, the chain part 46B is formed at the center position in the direction orthogonal to the longitudinal direction of the chain bus bar 33B.

  That is, in the method for manufacturing the battery wiring module 80 according to the second embodiment, the chain portion 46B is not covered with the insulating resin portion 23 in the covering step. In the breaking process, only the chain part 46B of the chain circuit body 60B is broken, and the insulating resin part 23 is not broken. For this reason, notch loss does not occur in the insulating resin part 23, and the durability of the insulating resin part 23 can be improved. Moreover, since the chain part 46B is not covered with the insulating resin part 23 in the chain bus bar 33B in which the chain part 46B is arranged at the center position, the presence or absence of the chain part 46B after the breaking process can be easily visually confirmed.

Next, a battery wiring module 90 according to a third embodiment of the present invention will be described.
In the description of the third embodiment, the same members as those in the battery wiring module 30B of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
In the battery wiring module 90 according to the third embodiment, a long chain circuit body 60 is formed in the disposing step and the covering step, similarly to the battery wiring module 30B of the first embodiment (FIG. 5B). )reference).

  Then, after the chain circuit body 60 is cut to a desired length in the longitudinal direction, in the breaking process, when the chain portion 46 of the chain bus bar 33 in the chain circuit body 60 is broken, as shown in FIG. The remaining part of the chain bus bar 33 and a part of the voltage detection line 40 are punched, leaving the four bus bars 32A.

  Each end 21a, 21b, 21c, 21d, which is one end of the plurality of linear conductors 21 in the voltage detection line 40 arranged in parallel with the four bus bars 32A, is formed in a staircase shape that rises from the right side to the left side. . That is, the length of the end portion 21a of the linear conductor 21 on the near side is the longest, and the length of the end portion 21d of the linear conductor 21 on the far side is the shortest.

Next, as shown in FIG. 11B, in the connection step, the spaces between the linear conductors 21 at the end portions 21a, 21b, 21c, and 21d of the plurality of linear conductors 21 covered with the insulating resin portion 23 are different. After being separated from each other leaving the end portions, the end portions 21a, 21b, 21c, and 21d are bent substantially at right angles toward the corresponding bus bars 32A, and are welded to the predetermined bus bars 32A.
Then, the connector 50 is connected and fixed to one end of the voltage detection line 40, whereby the battery wiring module 90 is completed.

  Therefore, according to the manufacturing method of the battery wiring module 90 according to the third embodiment, the insulating resin portion 23 between the linear conductors 21 is cut off, and the end portions 21a, 21b, 21c, and 21d of the linear conductor 21 are connected to the bus bar. The predetermined linear conductor 21 and the bus bar 32A can be electrically connected by a simple operation of welding to 32A.

  Therefore, according to the manufacturing method of the battery wiring modules 30A, 30B, 80, 90 according to the above-described embodiments, the battery cell 12 can be easily wired with a simple structure, and can be manufactured with high versatility. Cost can be reduced.

Here, the features of the embodiment of the method for manufacturing the battery wiring module according to the present invention described above will be briefly summarized below.
[1] Battery wiring combined with a battery module (20) having a plurality of battery cells (12) arranged so that the positive electrode terminal (13A) and the negative electrode terminal (13B) are alternately stacked in the opposite direction so as to be adjacent to each other. A method of manufacturing a module (30A, 30B),
A long chain bus bar (33) in which a plurality of bus bars (32A, 32B) are connected by a chain part (46) along at least one side of a plurality of linear conductors (21) arranged in parallel at a predetermined interval. ) Are arranged in parallel, and
The outer peripheral portion of the plurality of linear conductors (21) and the side edge portion (33a) adjacent to the plurality of linear conductors (21) in the chain bus bar (33) were integrally molded. A coating step of being covered with the insulating resin portion (23);
After the covering step, the chain portion (46) of the chain bus bar (33) is broken, so that a plurality of the positive electrode terminals (13A) and the negative electrode terminals (13B) are electrically connected to each other. A breaking step in which the bus bars (32A, 32B) are separated;
The battery wiring module (30A, 30B) comprising: a connecting step in which the plurality of linear conductors (21) are electrically connected to the predetermined bus bars (32A, 32B), respectively. Method.
[2] The chain bus bar (33) in the covering step is formed with a terminal insertion hole (34) for inserting the positive terminal (13A) and the negative terminal (13B). The manufacturing method of the battery wiring module (30A, 30B) as described in said [1].
[3] The battery wiring module according to [1] or [2], wherein the chain part (46) is formed on the side edge part (33a) of the chain bus bar (33). 30A, 30B).
[4] The battery according to [1] or [2], wherein the chain part (46B) is formed at a central position in a direction orthogonal to the longitudinal direction of the chain bus bar (33B). Manufacturing method of wiring module (80).

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 12 ... Battery cell 13A ... Positive electrode terminal 13B ... Negative electrode terminal 20 ... Battery module 21 ... Linear conductor 23 ... Insulation resin part 30A, 30B ... Battery wiring module 32A, 32B ... Bus bar 33 ... Chain bus bar 33a ... Side edge 34 ... Terminal Insertion hole 46 ... Chain

Claims (4)

A method of manufacturing a battery wiring module combined with a battery module comprising a plurality of battery cells arranged alternately and oppositely so that a positive electrode terminal and a negative electrode terminal are adjacent to each other,
An arrangement in which long chain bus bars in which only adjacent side edges of a plurality of bus bars are connected by a chain portion are arranged in parallel along at least one side of a plurality of linear conductors arranged in parallel at a predetermined interval. Process,
After the arrangement step, the outer peripheral portion of the plurality of linear conductors and the side edge portion adjacent to the plurality of linear conductors in the chain bus bar are covered with an integrally extruded insulating resin portion. A coating process;
After the covering step, the chain portions formed at predetermined intervals along the longitudinal direction of the chain bus bar are broken, so that a plurality of the positive electrode terminals and the negative electrode terminals are electrically connected to each other. A breaking step in which the bus bar is separated;
A method for manufacturing a battery wiring module, comprising: a connecting step in which the plurality of linear conductors are electrically connected to the predetermined bus bars, respectively , after the breaking step .   2. The battery wiring module manufacturing method according to claim 1, wherein a terminal insertion hole for inserting the positive terminal and the negative terminal is formed in the chain bus bar in the covering step. The chain part is formed at the side edge of the chain bus bar ;
In the covering step, the chain part is covered with the insulating resin part,
3. The method of manufacturing a battery wiring module according to claim 1 , wherein the chain portion is broken together with the insulating resin portion in the breaking step . The chain part is formed at a central position in a direction orthogonal to the longitudinal direction of the chain bus bar ,
In the coating step, the chain part is not covered by the insulating resin part,
The method for manufacturing a battery wiring module according to claim 1 , wherein the insulating resin portion is not broken in the breaking step .

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